The International Bank Account Number (IBAN) is an international standard for identifying bank accounts across national borders with a minimal risk of propagating transcription errors. UK clearings systems:
UK Clearing systems
BACS: Bulk electronic clearing
CHAPS Sterling: High value, same day sterling payment clearing
CHAPS Euro: High value, same day euro payment clearing
Cheque and Credit Clearing: Cheque clearing for Great Britain & Northern Ireland.
A sort code is a number which represents a bank branch and intended for internal processing. For a quick search the side bar contains the main search tool.